A 3-mm-thick glass window transmits 90 percent of the radiation between = 0.3 and 3.0 mm

A 3-mm-thick glass window transmits 90 percent of the radiation between λ = 0.3 and 3.0 mm and is essentially opaque for radiation at other wavelengths. Determine the rate of radiation transmitted through a 2-m × 2-m glass window from blackbody sources at

(a) 5800 K

(b) 1000 K.